1D non-LTE effects on populations and emergent fluxes. Departure coefficients for the lower (upper left panel) and upper (upper right panel) levels of the Be II313 nm lines as a function of the logarithmic Rosseland mean optical depth, for the standard model (black circles and lines), as well as with different ingredients in the model atom switched off in the statistical equilibrium calculations: the standard model without any Be I UV lines (blue open circles and lines); the same, but also without the Be II313 nm lines (red squares and lines); and the standard model without fine structure splitting of the Be II313 nm lines considered in the calculation of J_ν and subsequently when evaluating the radiative rates (No Be II313 nm F-S; orange diamonds and lines). Also shown are ratios of upper to lower departure coefficients (lower left panel), and the effects on the Be II313 nm lines as viewed in the emergent disc-integrated flux albeit without rotational broadening or macroturbulence (lower right panel). These calculations are based on the 1D MARCS model atmosphere and A(Be) = 1.18.